package beast.math.util;

/**
 * Methods from MathUtils in BEAST1
 */
public class MathUtils {
    /**
 * Returns sqrt(a^2 + b^2) without under/overflow.
 */
    public static double hypot(double a, double b) {
        double r;

	    if (Math.abs(a) > Math.abs(b)) {
		    r = b/a;
		    r = Math.abs(a)*Math.sqrt(1+r*r);
	    } else if (b != 0) {
		    r = a/b;
		    r = Math.abs(b)*Math.sqrt(1+r*r);
	    } else {
		    r = 0.0;
	    }
	    return r;
    }
}
